52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
#!/usr/bin/env python3
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"""Check only mro_implementation's first loop index and validation semantics."""
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import re
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from pathlib import Path
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source = Path("cpython/Objects/typeobject.c").read_text()
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match = re.search(
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r"\nstatic PyObject \*\nmro_implementation\(PyTypeObject \*type\)\n\{(.*?)\n\}",
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source,
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re.S,
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)
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assert match, "mro_implementation definition missing"
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body = re.sub(r"/\*.*?\*/", "", match.group(1), flags=re.S)
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validation = body.split("if (n == 1)", 1)[0]
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assert re.match(
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r"\s*PyObject \*bases;\s*Py_ssize_t n;\s*Py_ssize_t i;"
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r"\s*PyObject \*\*to_merge;\s*PyObject \*result;\s*if\b",
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validation,
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), (
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"mro_implementation: first loop index must be declared in the opening block"
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)
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assert len(re.findall(r"\bPy_ssize_t\s+i\b", validation)) == 1, "declare first loop index exactly once"
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assert len(re.findall(r"\bi\s*=(?!=)", validation)) == 1, "initialize first loop index exactly once"
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expected = """
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PyObject *bases;
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Py_ssize_t n;
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Py_ssize_t i;
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PyObject **to_merge;
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PyObject *result;
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if (!_PyType_IsReady(type)) {
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if (PyType_Ready(type) < 0)
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return NULL;
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}
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bases = type->tp_bases;
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n = PyTuple_GET_SIZE(bases);
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for (i = 0; i < n; i++) {
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PyTypeObject *base = _PyType_CAST(PyTuple_GET_ITEM(bases, i));
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if (base->tp_mro == NULL) {
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PyErr_Format(PyExc_TypeError,
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"Cannot extend an incomplete type '%.100s'",
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base->tp_name);
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return NULL;
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}
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assert(PyTuple_Check(base->tp_mro));
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}
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"""
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assert validation.split() == expected.split(), (
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"mro_implementation: preserve readiness, initialization timing, loop bounds, "
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"increment, and base validation"
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)
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print("mro_implementation first loop index C89 declaration and unchanged validation: PASS")
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